﻿<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>欢迎登录后台管理系统</title>
    <link href="css/style.css" rel="stylesheet" type="text/css" />
    <script language="JavaScript" src="js/jquery.js"></script>
    <script src="js/cloud.js" type="text/javascript"></script>


    <script language="javascript">
        $(function(){
            $('.loginbox').css({'position':'absolute','left':($(window).width()-692)/2});
            $(window).resize(function(){
                $('.loginbox').css({'position':'absolute','left':($(window).width()-692)/2});
            })
        });
    </script>


</head>

<body style="background-color:#1c77ac; background-image:url(images/light.png); background-repeat:no-repeat; background-position:center top; overflow:hidden;">



<div id="mainBody">
    <div id="cloud1" class="cloud"></div>
    <div id="cloud2" class="cloud"></div>
</div>


<div class="logintop">
    <span>欢迎登录后台管理界面平台</span>
    <ul>
        <li><a href="#">回首页</a></li>
        <li><a href="#">帮助</a></li>
        <li><a href="#">关于</a></li>
    </ul>
</div>

<div class="loginbody">

    <span class="systemlogo"></span>

    <div class="loginbox">

        <ul>
            <li><input name="" type="text" class="loginuser" value="" id="username"/></li>
            <li><input name="" type="password" class="loginpwd" value="密码" id="password"/></li>
            <li><input name="" type="button" class="loginbtn" value="登录"  onclick="subLogin()"  />
                <span id="tip" style="color:red"></span>

            </li>
        </ul>


    </div>

</div>



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</body>

</html>
<script type="application/javascript">
    function subLogin(){
        //  alert("xxxxxxxxxxxxx");
        //获取用户填写的账户何密码
        let username = document.getElementById("username").value
        let password = document.getElementById("password").value

        //判断用户填写的账号和密码是否为空
        if("" == username || password == ""){
            //  alert('账号和密码都不能为空');
            document.getElementById("tip").innerHTML = "账号和密码不能为空"
            return
        }
        document.getElementById("tip").innerHTML = ""
        //将用户的账号和密码发送给后端验证是否正确,正确就跳转到系统的首页，错误的话就停在当前页面，并且告诉用户账号或密码错误
        $.ajax({
            url:"login",//后端的请求地址
            type:"POST",//请求方式
            data:{
                username: username,
                password: password
            },
            dataType:"text",//后端返回的数据类型
            success:function(res) {//请求完毕的回调函数
                console.log('res',res)
                if(res == "Y"){
                    //登录成功
                    localStorage.setItem("username",username);
                    //将页面重定直到系统首页
                    window.location.href = "left.html"
                }else{
                    document.getElementById("tip").innerHTML = "账号或密码错误"
                    return
                }

            }
        })
    }
</script>